Can you install an expansion joint in a Direct Burial (DB) or Encased Burial (EB) application?
In normal circumstances, expansion fittings are not needed for Encased Burial (EB) installations since the movement of the conduit will coincide with the expansion and contraction of the concrete. The only location where an expansion fitting should be utilized is where the concrete itself has an expansion fitting. In Direct Burial (DB) situations, expansion fittings are not needed because the ground has relatively constant temperatures. However in cold areas, conduit must be installed below the frost line to prevent damage during freezing and thawing cycles.
